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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) |
Schedule of components of accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Unrealized Gains |  | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | and Losses | ​ | Gains and | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | on Securities | ​ | Losses on | ​ | ​ | ​
​ | ​ | Benefit | ​ | Available | ​ | Cash Flow | ​ | ​ | ​
(Dollars in thousands) | ​ | Plans | ​ | for Sale | ​ | Hedges | ​ | Total
Three Months Ended September 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at June 30, 2020 | ​ | $ | (149) | ​ | $ | 48,315 | ​ | $ | (35,427) | ​ | $ | 12,739
Other comprehensive income before reclassifications | ​ |  | — | ​ |  | 1,494 | ​ |  | 128 | ​ |  | 1,622
Amounts reclassified from accumulated other comprehensive income | ​ |  | — | ​ |  | (12) | ​ |  | 2,697 | ​ |  | 2,685
Net comprehensive income | ​ |  | — | ​ |  | 1,482 | ​ |  | 2,825 | ​ |  | 4,307
Balance at September 30, 2020 | ​ | $ | (149) | ​ | $ | 49,797 | ​ | $ | (32,602) | ​ | $ | 17,046
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at June 30, 2019 | ​ | $ | (297) | ​ | $ | 12,944 | ​ | $ | (11,181) | ​ | $ | 1,466
Other comprehensive income (loss) before reclassifications | ​ |  | — | ​ |  | 5,824 | ​ |  | (3,891) | ​ | ​ | 1,933
Amounts reclassified from accumulated other comprehensive income | ​ |  | — | ​ |  | (341) | ​ |  | (188) | ​ |  | (529)
Net comprehensive income (loss) | ​ |  | — | ​ |  | 5,483 | ​ |  | (4,079) | ​ |  | 1,404
Balance at September 30, 2019 | ​ | $ | (297) | ​ | $ | 18,427 | ​ | $ | (15,260) | ​ | $ | 2,870
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2019 | ​ | $ | (149) | ​ | $ | 11,922 | ​ | $ | (10,756) | ​ | $ | 1,017
Other comprehensive income (loss) before reclassifications | ​ | ​ | — | ​ | ​ | 37,887 | ​ | ​ | (26,638) | ​ | ​ | 11,249
Amounts reclassified from accumulated other comprehensive income | ​ |  | — | ​ |  | (12) | ​ |  | 4,792 | ​ |  | 4,780
Net comprehensive income (loss) | ​ |  | — | ​ |  | 37,875 | ​ |  | (21,846) | ​ |  | 16,029
Balance at September 30, 2020 | ​ | $ | (149) | ​ | $ | 49,797 | ​ | $ | (32,602) | ​ | $ | 17,046
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2018 | ​ | $ | (6,450) | ​ | $ | (18,394) | ​ | $ | (37) | ​ | $ | (24,881)
Other comprehensive income (loss) before reclassifications | ​ |  | — | ​ |  | 34,732 | ​ |  | (14,766) | ​ |  | 19,966
Amounts reclassified from accumulated other comprehensive income | ​ |  | 6,153 | ​ |  | 2,089 | ​ |  | (457) | ​ |  | 7,785
Net comprehensive income (loss) | ​ |  | 6,153 | ​ |  | 36,821 | ​ |  | (15,223) | ​ |  | 27,751
Balance at September 30, 2019 | ​ | $ | (297) | ​ | $ | 18,427 | ​ | $ | (15,260) | ​ | $ | 2,870
Schedule of reclassifications out of accumulated other comprehensive income (loss), net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | ​ | ​
(Dollars in thousands) | ​ | For the Three Months Ended September 30, | ​ | For the Nine Months Ended September 30, | ​ | ​
Accumulated Other Comprehensive Income (Loss) Component |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | Income Statement Line Item Affected
(Gains) losses on cash flow hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rate contracts | ​ | $ | 3,457 | ​ | $ | (241) | ​ | $ | 6,143 | ​ | $ | (585) | ​ | Interest expense
​ | ​ | ​ | (760) | ​ | ​ | 53 | ​ |  | (1,351) | ​ | ​ | 128 | ​ | Provision for income taxes
​ | ​ | ​ | 2,697 | ​ | ​ | (188) | ​ |  | 4,792 | ​ | ​ | (457) | ​ | Net income
(Gains) losses on sales of available for sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | (15) | ​ | $ | (437) | ​ | $ | (15) | ​ | $ | 2,679 | ​ | Securities gains (losses), net
​ | ​ | ​ | 3 | ​ | ​ | 96 | ​ | ​ | 3 | ​ | ​ | (590) | ​ | Provision for income taxes
​ | ​ | ​ | (12) | ​ | ​ | (341) | ​ | ​ | (12) | ​ | ​ | 2,089 | ​ | Net income
Losses and amortization of defined benefit pension: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Actuarial losses | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 7,888 | ​ | Salaries and employee benefits
​ | ​ | ​ | — | ​ | ​ | — | ​ |  | — | ​ | ​ | (1,735) | ​ | Provision for income taxes
​ | ​ | ​ | — | ​ | ​ | — | ​ |  | — | ​ | ​ | 6,153 | ​ | Net income
Total reclassifications for the period | ​ | $ | 2,685 | ​ | $ | (529) | ​ | $ | 4,780 | ​ | $ | 7,785 | ​ | ​

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